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首页> 外文期刊>Journal of Applied Physics >Finite element modeling of acoustic wave propagation and energy deposition in bone during extracorporeal shock wave treatment
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Finite element modeling of acoustic wave propagation and energy deposition in bone during extracorporeal shock wave treatment

机译：体外冲击波治疗过程中声波在骨骼中传播和能量沉积的有限元建模

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摘要

It is well known that extracorporeal shock wave treatment is capable of providing a non-surgical and relatively pain free alternative treatment modality for patients suffering from musculoskeletal disorders but do not respond well to conservative treatments. The major objective of current work is to investigate how the shock wave (SW) field would change if a bony structure exists in the path of the acoustic wave. Here, a model of finite element method (FEM) was developed based on linear elasticity and acoustic propagation equations to examine SW propagation and deflection near a mimic musculoskeletal bone. High-speed photography experiments were performed to record cavitation bubbles generated in SW field with the presence of mimic bone. By comparing experimental and simulated results, the effectiveness of FEM model could be verified and strain energy distributions in the bone were also predicted according to numerical simulations. The results show that (1) the SW field will be deflected with the presence of bony structure and varying deflection angles can be observed as the bone shifted up in the z-direction relative to SW geometric focus (F2 focus); (2) SW deflection angels predicted by the FEM model agree well with experimental results obtained from high-speed photographs; and (3) temporal evolutions of strain energy distribution in the bone can also be evaluated based on FEM model, with varied vertical distance between F2 focus and intended target point on the bone surface. The present studies indicate that, by combining MRI/CT scans and FEM modeling work, it is possible to better understand SW propagation characteristics and energy deposition in musculoskeletal structure during extracorporeal shock wave treatment, which is important for standardizing the treatment dosage, optimizing treatment protocols, and even providing patient-specific treatment guidance in clinic.
机译：众所周知，体外冲击波治疗能够为患有肌肉骨骼疾病的患者提供非手术且相对无疼痛的替代治疗方式，但是对保守治疗的反应却不佳。当前工作的主要目的是研究如果声波路径中存在骨结构，冲击波（SW）场将如何变化。在此，基于线性弹性和声传播方程，开发了有限元方法（FEM）模型，以检查模拟骨骼肌肉附近的SW传播和挠度。进行高速摄影实验以记录在SW场中模拟骨骼的存在下产生的空化气泡。通过比较实验结果和模拟结果，可以验证有限元模型的有效性，并根据数值模拟来预测骨骼中的应变能分布。结果表明：（1）SW场将在存在骨结构的情况下发生偏转，并且随着骨骼相对于SW几何焦点（F2焦点）沿z方向上移，可以观察到不同的偏转角； （2）有限元模型预测的西南偏角与高速照片的实验结果吻合良好。 （3）还可以基于FEM模型，在F2焦点和骨骼表面上的预期目标点之间的垂直距离变化的情况下，评估骨骼中应变能分布的时间演变。本研究表明，通过结合MRI / CT扫描和有限元建模工作，可以更好地了解体外冲击波治疗期间肌肉骨骼结构中的SW传播特性和能量沉积，这对于规范治疗剂量，优化治疗方案非常重要，甚至在临床中提供针对患者的治疗指导。

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  • 来源
    《Journal of Applied Physics》 |2013年第24期|244901-244901|共1页
  • 作者

    Wang Xiaofeng; Matula Thomas J.; Ma Yong; Liu Zheng;

  • 作者单位

    Key Laboratory of Modern Acoustics (Nanjing University), Ministry of Education, Nanjing, Jiangsu 210093, China|c|;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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